- Members: Yuichi Horiuchi, Masashi Iwanami (岩波昌志)
D,IOS Inc. is a full-service music production company and a recording studio founded on July 7th, 1999. Yuichi Horiuchi is usually the one handling the arrangement, instruments and programming of the licensed covers. He also worked with bass player Ken Sasaki on a few songs.
- D,IOS is credited in the Special Thanks of pop'n music 19 TUNE STREET original soundtrack.
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